Having owned 1 BMW and 5 VWs my views are the exact opposite - the BMW was by far the most expensive (and fastest) car I have ever owned but although it was new it had a lot of mechanical problems and really wasn't that comfortable.
All of the VW group cars I have had have been great - haven't had a single problem with them.
Well, high quality craftsmanship and attention to detail can be present even on a product with critical defects.
How? To generalize/stereotype, the routine downfall of German industry has been over-engineering. In other words, it's an amazing product, but good lord it is so complicated, no-one could ever iron out all the bugs.